Rotary water pump



SePf- 12, 1944.l J. R. HAGsTRoM 2,358,226

ROTARY WATER PUMP Fild Dec. 21, 1942 23 I l 'l y .2 j I Jofmgsmm 2? ,J Y. 3' l ATTORNEYS Patented Sept. 12, 1944 `'UNITED STATES PATENT y0l?`.l- `fl C-l?. l

v 2,358,226 a ROTARY WATER PUMB John R. Hagstrom, Englishtown, J. Application December 21, 1942, Serial No. 469,690v I 2 claims. (ci. 10g-137') `This invention relates to rotary water pumps and has for an object to provide vanes for the rotor spring pressed away from each other to maintain leather backing strips in tight er1-- gagement with the eccentric wall of the stator so that `the varies will be actuated by the eccentric wall to suck liquid from the inlet side of the pump casing and discharge it from the outlet side of the pump casing when the rotor is driven at high speed, without air locks being formed in the casing and without back pressure, which ordinarily in centrifugal or rotary pumps reduces the eiectiveness of the pump and increases Wear on the moving parts.

A further object is to provide apparatus of this character which will be formed of a few strong, simple and durable parts, which will be inexpensive to manufacture, and which will not easily get out of order.

With the above and other objects in View, the

invention consists of certain novel details of construction and combinations of parts hereinafter fully described and claimed, it being understood that various modifications may be resorted to within the scope of the appended claims without departing from the spirit or sacrificing anyrof the advantages of the invention.

In the accompanying drawing forming a par of this specification: f

Figure 1 is aside elevation of a pump constructed in accordance with the invention and showing the electric motor for driving the pump and'pressure switch, the latter two members being conventional.

Figure 2 is a cross sectional viewof the pump with parts in elevation.

Figure 3 is a cross sectional view of the pump with one of the housing plates removed, taken in a plane at a right angle to the plane of the section of Figure 2.

Figure 4 is a detail perspective View of the rotor and stub shafts f or mounting the rotor in the housing.

Figure 5 is a detail perspective view of the holder member of one of the vanes.

Figure 6 is a detail perspective View of the spring carrier which is disposed between both vanes.

Figure '7 is a side elevation of the rotor showing the gudgeons which connect the two sections of the rotor together.

ing, the Vsame being substantially rectangular in contour, Ase'e Figure`3', rand closed at the sides b-y side plates yI I, secured to the housing `by`bolts -I2,-see Figure 2.V

A cylindrical stator I3 is mounted vtransversely in the pump housing. The ends of the'vstator are closed by the side plates `I I "and the stator is held in place by lugs-I4, see Figure 2, which 'projects inwardly fromthe housing and Yhave rounded` extreme ends conforming to the wcurvature of the outer surface fof thev stator. The`-` stator is provided in the bottoni withiniet ptits 15ans is providedv vin the top with outlt'ports lthese ports extending throughout an' area'fof the stator, see `Figure 3.

An voutlet pipe I1 is-tlireadedly engaged through the pump housing at the top thereof, as shown at I8, andV projects into the 'housing to Ya Vpoint spaced from the stator s that anYK air space or cushion` I9'eXist's aroundl the` outlet 'pipein the upper end of the housing. y

An. inlet pipe 20 is threadedly elr-igavgedA through the bottom of the housing, as shownl at 2 I, and the pipe terminatesat the inner face of the housing so'that a Yliquid space 22 exists in the housing below the inlet ports I i5 o f the stator. Apriming pipeV 523' enters one side of the pump housing. The priming pipe communicates with the chamber 422 in the bottom of the housing.

' An important feature of the invention is the rotor and parts carried thereby. Asbest shown in Figure 4, the rotor 24 comprises two semicylindrical sections v25 having their flatv sides spacedk from each other. The sections areA secured together by aligned' gudgeons 26 and 21 which enter 'recesses in' tliejends 'of the'sections and vare welded or votherwise rigidly secured to the sections. The gudgeon 26 is hollow and forms a shaft for rotating the rotor. The gudgeon is provided with a tapered inner end 28 which enters a correspondingly shaped recess formed in the sections. The gudgeon 21 is provided on its inner end with a disk 29 which is countersunk in a similarly shaped recess in the opposite end of sections. The tapered end 28 of the gudgeon 26 and the disk 29 of the gudgeon 21 are, as heretofore stated, welded or otherwise secured to the walls of their respective recesses to secure the sections of the rotor together as a4 unit.

The gudgeons 26 and 21 are mounted in respective bearing openings 30 and 3I in the side plates I I of the pump housing, see Figure 2'. 'Ihe bearing openings are disposed eccentric to the aXis of the cylindrical stator I3 so that the rotor is eccentrically mounted within the stator and engages the inner wall of the stator throughout a limited area of the outer circumferential face of theV stator, see Figure 3.

A pair of similar vanes 32 are slidably mounted to move endwise in the spaces between the sections 25 of the rotor. Each vane is substantially H-shaped in cross section and extends at the outer portion substantially the entire length of the rotor so as to engage the inner faces of the side plates II of the-pump housing, see Figure 2. The inner portion of the vane is cut away, as shown at 33 and '34, see Figure 5,V to receive the tapered end 28 of the gudgeon 26 and the disk y Y A spring carrier 36, see Figure 6, is interposed Y between both vanes and is in the form ofa solid block of material having a pair of spaced openings 31. A pair of helical springs, one of which is shown at 38 in Figure 3, is disposed in the openings 31 and project atboth ends into the confronting inner ends of the vanes 32. The springs constantly tend to urge the vanes away from each other so that good wiping engagement is maintained between the leather members 35 and the inner surfaces'of the stator during rotation of the rotor, and thus leakage past, the vanes is prevented.

In operation, when the rotor is rotated in the direction of the arrow, shownat 39 in Figure 3, liquid will be forced ahead of each vane as the vane begins to travel clockwise from the contacting surfaces of the rotor and stator, and as the Vane moves outwardly during rotation of the rotor, the liquid will be forced ahead of the vane out of the outlet openings I6. 'I'he companion vane meanwhile will be moved inwardly by contact with the inner surface of the stator as the iirst named vane is moved outwardly to begin its Working stroke when it arrives at a point slightly beyond the contacting surface of the rotor and the stator.

A grease connection 40, see Figure 2, is threadedly engaged with one of the side plates'II and communicates with an axial opening 4I formed in the gudgeon 21.

An air valve connection 42, of conventional construction, see Figure 3, is secured to the pump housing and communicates With the liquid chamber 22 in the bottom of the housing.

A pair of set screws 43 are engaged through the pump housing and through the lugs I4. The setI screws have reduced tips 44 which are engaged in openings 45 in the stator to rigidly secure the stator against dislodgment.

The pump is preferably driven by an electric motor 46, see Figure 1, which is coupled, as shown at 41, to a shaft 48 which extends through a bearing sleeve 49, see Figure 2, carried by one of the side plates II of the pump housing and has the inner end fixed to the gudgeon 26 which, as heretofore stated, forms means for rotating the rotor. A conventional grease cup 5U is secured to the bearing sleeve 49.

Preferably, an expansion chamber 5I, see Fig- Yure l, is secured to the outlet pipe I1 of the pump f openings in opposed s-ides thereof, a cylindrical rotor mounted eccentrically in the stator and provided with a longitudinal through slot, an elongated block fitted centrally within the slot of the rotor having spaced through bores, a vane slidably fitted in each outer portion of the slot, coiled compression springs extending through the bores in the block and bearing against the vanes to resiliently thrust; the same against the interior of the stator, and inlet pipe connecting with the housing and opening adjacent the inlet openings of the stator, and an outletpipe projecting into the housing having its inner open end disposed adjacent the outlet openings in the stator.

2. In a pump, a rotor including a pair of complementary sections spaced transversely to provide a longitudinal through slot therebetween, a flat elongated vane mounted longitudinally in each outer portion of the slot, said vane having a longitudinal groove in its outer portion and a longitudinal groove in its inner portion, an elon` gated block having longitudinally spacedbores therein fitted in the intermediate portion of the rotor slot, the inner grooved portions of the vanes being slidably tted over the opposed side portions of said block, compression springs extended through the bores of the block and bearing against the inner edges of the vanes to resiliently thrust the vanes outwardly, and a wear strip fitted in the outer groove of each of the vanes. JOHN R. HAGS'I'ROM. 

